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[Emacs-diffs] emacs-26 39e85a0: Note that lex bound lambda forms are not
From: |
Noam Postavsky |
Subject: |
[Emacs-diffs] emacs-26 39e85a0: Note that lex bound lambda forms are not self-quoting (Bug#33199) |
Date: |
Thu, 8 Nov 2018 20:24:50 -0500 (EST) |
branch: emacs-26
commit 39e85a0c6c8de75b446e8e4dc41cdfdca96907e3
Author: Noam Postavsky <address@hidden>
Commit: Noam Postavsky <address@hidden>
Note that lex bound lambda forms are not self-quoting (Bug#33199)
* doc/lispref/functions.texi (Anonymous Functions):
* lisp/subr.el (lambda): Note that under lexical binding a lambda form
yields a closure object (Bug#33199).
---
doc/lispref/functions.texi | 9 ++++++---
lisp/subr.el | 13 +++++++------
2 files changed, 13 insertions(+), 9 deletions(-)
diff --git a/doc/lispref/functions.texi b/doc/lispref/functions.texi
index 242d754..216666c 100644
--- a/doc/lispref/functions.texi
+++ b/doc/lispref/functions.texi
@@ -1082,15 +1082,18 @@ This macro returns an anonymous function with argument
list
@var{args}, documentation string @var{doc} (if any), interactive spec
@var{interactive} (if any), and body forms given by @var{body}.
-In effect, this macro makes @code{lambda} forms self-quoting:
-evaluating a form whose @sc{car} is @code{lambda} yields the form
-itself:
+Under dynamic binding, this macro effectively makes @code{lambda}
+forms self-quoting: evaluating a form whose @sc{car} is @code{lambda}
+yields the form itself:
@example
(lambda (x) (* x x))
@result{} (lambda (x) (* x x))
@end example
+Note that when evaluting under lexical binding the result is a closure
+object (@pxref{Closures}).
+
The @code{lambda} form has one other effect: it tells the Emacs
evaluator and byte-compiler that its argument is a function, by using
@code{function} as a subroutine (see below).
diff --git a/lisp/subr.el b/lisp/subr.el
index 59f6949..d097893 100644
--- a/lisp/subr.el
+++ b/lisp/subr.el
@@ -93,12 +93,13 @@ Info node `(elisp)Specification List' for details."
`(put (quote ,symbol) 'edebug-form-spec (quote ,spec)))
(defmacro lambda (&rest cdr)
- "Return a lambda expression.
-A call of the form (lambda ARGS DOCSTRING INTERACTIVE BODY) is
-self-quoting; the result of evaluating the lambda expression is the
-expression itself. The lambda expression may then be treated as a
-function, i.e., stored as the function value of a symbol, passed to
-`funcall' or `mapcar', etc.
+ "Return an anonymous function.
+Under dynamic binding, a call of the form (lambda ARGS DOCSTRING
+INTERACTIVE BODY) is self-quoting; the result of evaluating the
+lambda expression is the expression itself. Under lexical
+binding, the result is a closure. Regardless, the result is a
+function, i.e., it may be stored as the function value of a
+symbol, passed to `funcall' or `mapcar', etc.
ARGS should take the same form as an argument list for a `defun'.
DOCSTRING is an optional documentation string.
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